Mention the time period of Proterozoic period and Paleozoic era and give one major event of each era.
1 Answer
| Time duration | Major event | |
| Precambrian era | 4500 my - 570 my ago | Evolution of earth |
| Paleozoic era | 570 my - 250 my ago | Development of pteridophytes, marine invertebrates. |
-
A man suffering from anaemia feels tired after a short work. Explain. 1
-
Compose a dialogue between two friends about the causes and effects of the second world war. 1
-
Prepare a story including to causes and effects of the first world war. 1
-
How does seismograph measure the magnitude of the earthquake. 1
-
Though earthquake can not be prevented, its damages can be minimized: 1
-
What is the rate of decrease of temperature per kilometer as we go up in troposphere. 1